2873 Binzel

2873 Binzel, provisional designation 1982 FR, is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 28 March 1982, by American astronomer Edward Bowell at the Anderson Mesa Station in Flagstaff, Arizona.[10] The asteroid was named after astronomer Richard Binzel.[2] Its 1.6-kilometer minor-planet moon was discovered in 2019.[5]

2873 Binzel
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date28 March 1982
Designations
(2873) Binzel
Named after
Richard Binzel
(American astronomer)[2]
1982 FR · 1935 KH
1935 MH · 1938 GA
1959 RA1
main-belt · (inner)
Flora [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc81.27 yr (29,683 days)
Aphelion2.6074 AU
Perihelion1.8954 AU
2.2514 AU
Eccentricity0.1581
3.38 yr (1,234 days)
112.97°
0° 17m 30.48s / day
Inclination5.9003°
100.97°
168.33°
Known satellites1[5]
Physical characteristics
Dimensions6.426±0.471 km[6]
6.48 km (calculated)[3]
7.011±0.063 km[7]
11.560±0.0037 h[8]
0.2307±0.0722[7]
0.24 (assumed)[3]
0.272±0.060[6]
SMASS = Sq [1] · S [3]
12.660±0.002 (R)[8] · 12.99[1][7] · 13.10±0.41[9] · 13.11[3]

    Orbit and classification

    Binzel is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[3][4][11]:23 It orbits the Sun in the inner main belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,234 days). Its orbit has an eccentricity of 0.16 and an inclination of 6° with respect to the ecliptic.[1]

    The body's observation arc begins with its identification as 1935 KH at the Johannesburg Observatory in 1935, almost 47 years prior to its official discovery observation at Anderson Mesa.[10]

    Physical characteristics

    In the SMASS classification, Binzel is a Sq-subtype, which transition from the common stony S-type asteroids to the less common Q-types.[1]

    Rotation period

    In September 2010, a rotational lightcurve of Binzel was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 11.560 hours with a brightness variation of 0.14 magnitude (U=2).[8]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Binzel measures 6.426 and 7.011 kilometers in diameter and its surface has an albedo of 0.2307 and 0.272, respectively.[6][7]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 6.48 kilometers based on an absolute magnitude of 13.11.[3]

    Naming

    This minor planet was named after American astronomer Richard Binzel (born 1958) of the University of Texas at Austin. During the 1980s, Binzel has been a prolific photometrist, obtaining a large number of rotational lightcurves of main-belt asteroids. The official naming citation was prepared by Alan W. Harris and published by the Minor Planet Center on 8 November 1984 (M.P.C. 9215).[2][12]

    References
    1. "JPL Small-Body Database Browser: 2873 Binzel (1982 FR)" (2016-08-29 last obs.). Jet Propulsion Laboratory. Retrieved 30 August 2017.
    2. Schmadel, Lutz D. (2007). "(2873) Binzel". Dictionary of Minor Planet Names – (2873) Binzel. Springer Berlin Heidelberg. p. 236. doi:10.1007/978-3-540-29925-7_2874. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2873) Binzel". Asteroid Lightcurve Database (LCDB). Retrieved 30 August 2017.
    4. "Asteroid 2873 Binzel – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. Johnston, Wm. Robert (27 May 2019). "Asteroids with Satellites Database – (2873) Binzel". Johnston's Archive. Retrieved 4 June 2019.
    6. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 30 August 2017.
    7. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    8. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 30 August 2017.
    9. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 30 August 2017.
    10. "2873 Binzel (1982 FR)". Minor Planet Center. Retrieved 30 August 2017.
    11. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 30 August 2017.

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